Why package management for Unix when complete Installer on Windows is more attractive? [closed]

Maybe you should look at Linux Mint. The short way is to tell you that it's just not the *nix way. Bundling everything easily leads to stagnancy and dependency on outdated versions of libraries, to say nothing of the size of the WinSxS folder (how many copies of the VC2003/5/8 runtimes do you think you have?). It's certainly possible to do it the way you're suggesting (and a lot of packages you install yourself will, in fact, do just that in /usr/local), but the system package manager does not.